"...first-year students’ academic achievement and retention: first-year students who used libraries in their first semester had higher grade point averages and retention when controlling for additional factors"
Soria, K. M. & Fransen, J. & Nackerud, S.(2013). Library use and undergraduate student outcomes: New evidence for students’ retention and academic success. portal: Libraries and the Academy 13(2), 147-164. The Johns Hopkins University Press. Retrieved August 22, 2014, from Project MUSE database.